For yucks I put a pair of heading hold gyros on my Funtana S90.

One for the rudder and another for the elevator.

I hooked these up so I could disable or enable them with another transmitter channel.

With both in place I could fly the plane into a nose up entry into a hover, flip the switch, and the plane would torque roll all by itself until it ran out of fuel.

It impressed people who did not know what was going on, but I quickly lost interest.

Still it was sort of fun for a flight or two.